雙頻濾波器暨手持式數位視訊廣播模組之研發

Abstract

本篇論文前段提出一個應用於無線區域網路802.11 a, b, g之雙頻濾波器，其雙頻率波器是由一個二階電感性帶通濾波器串接一個電容性帶通濾波器所組成，藉由雙埠阻抗分析可得一雙頻濾波器響應，再藉由串聯兩個具有異號相位的雙埠網路，可於兩通帶之間得一有限傳輸零點，並進一步利用原本所設計之雙頻濾波器再串接一電容或電感，可得一具多傳輸零點之雙頻濾波器，而最後之量測結果也符合本篇論文所提之理論；後段將提出一應用於手持式數位視訊廣播(DVB-H)之模組，此模組包含一帶通濾波器過濾不需要的雜訊，後接一低雜訊放大器(LNA)，最後再接一低通濾波器，此模組是利用LTCC將帶通濾波器及低通濾波器等被動元件整合為載版，在利用System On Chip (SOP)的概念，把低雜訊放大器置於載版之上，在最後的量測結果大多也都符合了規格所要求。

In this thesis, first we introduce a new structure of dual bandpass filter applying for IEEE 802.11a/b/g. By a serial configuration of a inductive coupled-line (ICL) filter and a capacitive coupled-line filter (CCL) filter, a dual bandpass filter can be designed with a transmission zero between the two passbands. By the two-poles Z matrix analysis, we find that the transmission coefficient of the dual bandpass filter has approximately the same behavior as the individual single-band filter around the corresponding pass-band. The measurements results also agree quite well with the simulation ones. In the next part, a front-end module applied for digital video broadcasting-handheld (DVB-H) is proposed. The module which passband is 470~702MHz includes a bandpass filter, a low noise amplifier (LNA), and a lowpass filter. We integrate the active/passive components by LTCC technology and the measurements almost conform to the specifications.